Cutting device

Abstract

To provide a cutting device that realizes automatic control of moving work to move a pulley on a guide rail and stopping work.SOLUTION: A cutting device 1 includes a guide rail 30, a movable body 5 that is provided movably along the guide rail 30, a pulley 20 provided on the movable body, an endless annular wire 10 that is stretched around the pulleys including the pulley 20 and a drive pulley 22, and a wire drive mechanism 4 that drives the wire 10. In the cutting device that cuts a structure by driving the wire 10 by the wire drive mechanism 4 and bringing the wire 10 into contact with the structure, there is control means 6 that controls the movement and stopping of the movable body 5.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a cutting device that drives an endless ring-shaped wire to cut a structure.

Background Art

[0002] Conventionally, for example, as a cutting device for cutting a structure such as a reinforced concrete floor slab of a bridge, it is spanned over a driving pulley, a driven pulley, one side pulley serving as a fulcrum during cutting, and the other side pulley serving as a fulcrum during cutting. By performing circular movement, an endless ring-shaped wire configured to be able to cut a cutting target portion of a structure to be contacted, and a wire driving mechanism that rotates the driving pulley and moves both or either one of the driving pulley and the driven pulley to drive the wire. By driving the wire by the wire driving mechanism, a cutting device that cuts a cutting target portion of a structure that contacts a portion of the wire between the one side pulley and the other side pulley is known (see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the cutting device of Patent Document 1, by moving the portion of the wire between the one side pulley and the other side pulley in the cutting direction, the wire is pushed into the cutting target portion to cut the cutting target portion by a predetermined length (the amount of cutting allowance). After that, in order to secure the cutting allowance for the next cutting operation, it is necessary to move the one side pulley and the other side pulley on the guide rail. However, since the process of moving the pulley along the guide rail is carried out by an operator controlling a hydraulic cylinder, which is the power source for moving the pulley, there was a challenge in that it was difficult to adjust the timing and amount of movement of the pulley. This invention provides a cutting device that enables automatic control of the movement and stopping operations of a pulley on a guide rail. [Means for solving the problem]

[0005] The cutting device according to the present invention comprises a guide rail, a movable body provided to move along the guide rail, a pulley provided on the movable body, an endless annular wire stretched over a plurality of pulleys including the pulley and a drive pulley, and a wire drive mechanism for driving the wire, and cuts a structure by driving the wire with the wire drive mechanism to bring the wire into contact with the structure, and further comprises control means for controlling the movement and stopping of the movable body. The movable body is equipped with detection means for detecting changes in the wire's posture as the wire cutting operation progresses while the movable body is stopped. The control means alternately repeats a movable body drive process, which moves the movable body by a predetermined distance and then stops it when it receives from the detection means that the wire's posture has reached a predetermined posture, and a movable body stop and maintain process, which keeps the movable body stopped until the wire cutting operation progresses and the wire's posture reaches the predetermined posture. It is characterized by the following: Furthermore, the device is characterized in that it comprises, as a guide rail, one guide rail and another guide rail provided parallel to the first guide rail; as a movable body, one movable body provided to be movable along the first guide rail and another movable body provided to be movable along the other guide rail; as a pulley, one pulley provided on the first movable body and another pulley provided on the other movable body; and an endless annular wire is stretched over a plurality of pulleys including the first pulley, the other pulley and a drive pulley, and the portion of the wire between the first pulley and the other pulley driven by the wire drive mechanism is made to contact a structure and cut the structure. Furthermore, the structure is a deck slab attached to the upper surface of the girder, with one guide rail and the other guide rail positioned on either side of the girder, and the portion of the wire driven by the wire drive mechanism between one pulley and the other pulley is brought into contact with the part of the deck slab to be cut near the boundary between the deck slab and the upper surface of the girder. Part to be amputated It is characterized by being configured to cut. 。 Ma Furthermore, the movable body is equipped with a motor having a pinion that engages with a rack provided on a guide rail, and the control means is characterized in that, in the movable body driving process, the motor is driven to move the movable body by a predetermined distance, and in the movable body stop maintenance process, the motor is kept in a stopped state. The cutting device according to the present invention makes it possible to automate the movement and stopping operations of the pulley on the guide rail. [Brief explanation of the drawing]

[0006] [Figure 1] A plan view from above of the cutting device attached to the underside of the deck slab. [Figure 2] This figure shows the view from direction A in Figure 1. [Figure 3] This figure shows an example of pulley arrangement as viewed from direction B in Figure 1. [Figure 4] A plan view showing the movable body. [Figure 5] Front view showing the movable part. [Figure 6] An explanatory diagram showing the relationship between the state change of the wire and the state change of the detection means. [Modes for carrying out the invention]

[0007] A structural cutting device according to an embodiment will be described with reference to Figures 1 to 6. The cutting device 1 according to this embodiment comprises a guide rail 30, a movable body 5 movably mounted along the guide rail 30, a pulley 20 provided on the movable body 5, an endless annular wire 10 stretched across a plurality of pulleys including the pulley 20 and a drive pulley 22, and a wire drive mechanism 4 for driving the wire 10. The cutting device 1 cuts a structure by driving the wire 10 with the wire drive mechanism 4 to bring the wire 10 into contact with the structure, and is configured to include control means 6 for controlling the movement and stopping of the movable body 5 along the guide rail 30.

[0008] The cutting device 1 is a cutting device (wire saw) 1 equipped with a wire 10 for cutting a portion 3A of the reinforced concrete deck 3, which is a structure attached to the upper surface 2t of the girder 2, near the boundary between the deck 3 and the upper surface 2t of the girder 2, for example, in demolition work when replacing the deck of a bridge. The portion to be cut 3A is, for example, the portion near the boundary with the upper surface 2t of the girder 2 in the haunch (tapered) portion of the deck slab 3, which is formed on the inclined lower surface 3ut that slopes upward from both ends in the width direction W of the upper surface 2t of the girder 2. Furthermore, the lower surface 3u of the deck slab 3 is the lower surface other than the inclined lower surface 3ut of the haunch portion. The wire 10 is formed, for example, from an endless annular diamond wire to which beads embedded with diamond abrasive grains are attached at regular intervals. Figure 1 is a plan view from above of the cutting device 1 attached to the underside of the bridge deck 3 during the demolition work for replacing the bridge deck 3. However, the parts of the deck 3 other than the cutting target area 3A (inclined underside 3ut) and the girder 2 are not shown. Furthermore, in this specification, the width direction is defined as the direction indicated by "W" in each figure, the cutting direction is defined as the direction indicated by "S" in each figure, and the vertical direction is defined as the direction indicated by "V" in each figure.

[0009] In the cutting device 1 for cutting the target portion 3A of the floor slab 3, as shown in Figure 1 for example, the guide rails 30 include one guide rail 30A and the other guide rail 30B, which are arranged parallel to each other on either side of the girder 2, extending along the extension direction of the girder 2 and facing the girder 2 on the lower surface 3u side of the floor slab 3 on both the left and right sides in the width direction W of the target portion 3A of the floor slab 3. Furthermore, the movable body 5 includes one movable body 5A that is movably mounted along one guide rail 30A, and the other movable body 5B that is movably mounted along the other guide rail 30B. Furthermore, the pulley 20 includes one pulley 20A attached to one movable body 5A, and the other pulley 20B attached to the other movable body 5B. In other words, one pulley 20A, which serves as a pivot point when pushing the circulating wire 10 into the part to be cut 3A, is provided on one movable body 5A, and the other pulley 20B, which serves as a pivot point when pushing the circulating wire 10 into the part to be cut 3A, is provided on the other movable body 5B. As a result, one of the pivot pulleys 20A is configured to move along one guide rail 30, and the other pivot pulley 20B is configured to move along the other guide rail 30B. The cutting device 1 is configured such that an endless annular wire 10 is stretched over a plurality of pulleys, including one pulley 20A, the other pulley 20B, and a drive pulley 22, and the portion of the wire 10 between the one pulley 20A and the other pulley 20B, driven by the wire drive mechanism 4, comes into contact with the floor slab 3 to cut the floor slab 3.

[0010] Driving the wire 10 means rotating the drive pulley 22 to move the wire 10 in a circular motion, and moving both or either the drive pulley 22 and the driven pulley 25 to pull the wire 10. For example, it means rotating the drive pulley 22 in the direction of arrow c in Figure 3 to move the wire 10 in a circular motion in the direction of arrow a in Figure 1, and moving both or either the drive pulley 22 and the driven pulley 25 in the directions of arrows d and e in Figure 3 to pull the wire 10 from, for example, the state shown in 10(b) in Figure 1 to the state shown in 10(c). In this way, by driving the wire 10, the portion between one pulley 20A and the other pulley 20B is pressed against the portion 3A of the floor slab 3 to be cut, causing the portion 3A to be cut (for example, the portion 3A between wire 10(a) and wire 10(c) in Figure 1) to be cut.

[0011] Moreover, causing the wire 10 to move in a circulating manner means that an endless annular wire 10 wound around each pulley so as to surround the outer sides of each pulley constituting a pulley group described later, which includes at least one pulley 20A and the other pulley 20B and a driving pulley 22, rotates and moves along an annular path formed so as to surround the outer side of the pulley group while receiving the rotational force of the driving pulley 22. In other words, circulating movement means a state in which the endless annular wire 10 wound around each pulley so as to surround the outer side of the pulley group rotates and moves in a circular motion around the outer side of the pulley group while receiving the rotational force of the driving pulley 22. For example, it means moving the wire 10 in a circular motion in the direction of arrow a in FIG. 1.

[0012] For example, as shown in FIG. 1, the cutting device 1 is configured such that the wire 10 is passed through a through hole 3a formed so as to penetrate across one inclined lower surface 3ut and the other inclined lower surface 3ut of the hunch portion, which is the cutting target portion 3A of the floor slab 3, and is wound around a driving pulley 20 and a plurality of driven pulleys including one pulley 20A and the other pulley 20B to form an endless loop. For example, one pulley 20A, the other pulley 20B, and the wire 10 are set to be in the state shown by the solid line in FIG. 1. Thereafter, one pulley 20A and the other pulley 20B are moved a predetermined distance in the cutting direction S as shown by arrow b1. As a result, the wire 10 is in the state shown in 10(b). Then, as shown in FIG. 3, while rotating the driving pulley 22 and moving both or either one of the driving pulley 22 and the driven pulley 25 to pull the wire 10, a portion of the wire 10 passed through the through hole 3a between one pulley 20A and the other pulley 20B in the circulating wire 10 bites into the floor slab 3 and is configured to cut the cutting target portion 3A in the cutting direction S. Incidentally, when moving one pulley 20A and the other pulley 20B a predetermined distance in the cutting direction S, while rotating the driving pulley 22 and moving both or either one of the driving pulley 22 and the driven pulley 25 to feed the wire 10 in the direction opposite to the pulling direction, one movable body 5A and the other movable body 5B are moved to move one pulley 20A and the other pulley 20B. For example, when the one movable body 5A and the other movable body 5B move, the wire 10 is pulled, and the drive pulley 22 follows and is automatically pulled upward as shown in FIG. 3.

[0013] That is, the cutting device 1 according to the embodiment first moves one pulley 20A and the other pulley 20B a predetermined distance in the cutting direction S as shown by the arrow b1 to secure the cutting allowance (cutting margin) for the cutting operation. Then, as described above, the wire 10 is circulated and pulled. As a result, as shown in FIG. 1, the portion of the wire 10 between the one pulley 20A and the other pulley 20B, which are the fulcrums during cutting and are arranged on both the left and right sides in the width direction W of the cutting target portion 3A, moves in the cutting direction S from the state of 10(b) to the state of 10(c), and the circulating wire 10 is pushed into the cutting target portion 3A, and the cutting target portion 3A of the floor slab 3 is cut. In this case, the cutting target portion 3A between the wire 10(a) and the wire 10(c) in FIG. 1 becomes the cutting allowance (cutting margin), and the cutting target portion 3A serving as this cutting allowance is cut.

[0014] Next, based on FIGS. 4 and 5, the configuration of the cutting device 1 will be described in detail. The pulley 20 (one pulley 20A and the other pulley 20B) serving as a fulcrum has a configuration including a pulley 20a and a rotation center axis 20b of the pulley 20a. The pulley 20a is constituted by a disc that can rotate about the rotation center axis 20b. A central through hole 20c penetrating the center of the circle of the disc constituting the pulley 20a is formed in the pulley 20a, and the rotation center axis 20b is provided so as to penetrate the central through hole 20c, and a pulley 20 is configured such that the pulley 20a can rotate about the rotation center axis 20b. In addition, an outer peripheral groove 20d for guiding the wire 10 is formed on the outer peripheral surface of the pulley 20a. Furthermore, the fulcrum pulleys 20 (one pulley 20A and the other pulley 20B) are driven pulleys that rotate in response to the force from the wire 10, which is stretched across the outer groove 20d and moves in a circulating manner.

[0015] The guide rail 30 is provided to extend along the direction of extension of the guide rail 30 and includes a rack 31 that engages with the pinion 51c described later, and a contact surface 32 of a movement assisting means 52 which is composed of wheels 54a or the like, described later. The rack 31 is provided, for example, on the underside of the guide rail 30 so as to extend along the direction of extension of the guide rail 30. The contact surface 32 is composed of, for example, a horizontal upper horizontal running surface 32a and a lower horizontal running surface 32b provided on the guide rail 30 so as to extend in the cutting direction S.

[0016] In addition to the pulley 20 described above, the movable body 5 (one movable body 5A and the other movable body 5B) is provided with a roller 40 and a detection means 60.

[0017] The movable body 5 is configured to be movable on the guide rail 30 by connecting the pulley 20, roller 40, and detection means 60 described above, and comprises a base body 50, a drive unit 51, and a movement assist means 52.

[0018] The base 50 includes, for example, a base portion 50a configured to surround the guide rail 30 on all sides (top, bottom, left, and right), a pulley connecting portion 50b for connecting the pulley 20, a roller connecting portion 50c for connecting the roller 40, detection means connecting portions 50d1, 50d2, and 50d3 for connecting the detection means 60, and a movable component connecting portion 50e for connecting the motor 51a and the movable assist means 52, which will be described later. Specifically, the pulley connecting portion 50b, the roller connecting portion 50c, the detection means connecting portions 50d1, 50d2, 50d3, and the movable component connecting portion 50e are each provided to extend from the base portion 50a, thereby forming the base body 50.

[0019] The pulley connecting portion 50b is composed of, for example, a columnar connecting portion attached to the base portion 50a, and a rotational axis 20b is provided on the upper end side of this pulley connecting portion 50b, and the pulley 20a is mounted so as to be rotatable about the rotational axis 20b as the center of rotation, thereby forming the pulley 20.

[0020] The drive unit 51 is configured to include a motor 51a provided on the base 50 and serving as a power source for moving the movable body 5, and a pinion 51c provided on the motor shaft 51b of the motor 51a and engaging with a rack 31 provided on the guide rail 30. Furthermore, the motor 51a is equipped with a rotary encoder 53 as a means for detecting the distance traveled by detecting the rotation angle of the motor shaft 51b and the distance traveled by the movable body 5. The rotary encoder 53 is connected to the motor shaft 51b, for example, by a belt (not shown), and is configured to detect the rotation angle of the motor shaft 51b.

[0021] Furthermore, the movement assisting means 52 is composed of, for example, wheels 54a that are provided to be able to travel on the upper running surface 32a and the lower running surface 32b of the guide rail 30. The wheels 54a are provided such that, for example, two wheels each are placed on the upper running surface 32a at the front and rear of the base 50 in the cutting direction S, and two wheels each are placed on the lower running surface 32b at the front and rear of the base 50 in the cutting direction S. In other words, for example, a configuration is provided in which a total of eight wheels 54a, 54a... is used so that the movable body 5 can move smoothly along the guide rail 30 along the cutting direction S.

[0022] The motor housing 50f of the motor 51a is fixed to the movable component connecting part 50e, and the wheels 54a, 54a... are rotatably connected to the movable component connecting part 50e.

[0023] The roller 40 is a regulating member that restricts the downward movement of the portion of the wire 10 between one pulley 20A and the other pulley 20B. The roller 40 comprises one roller 40A attached to one movable body 5A and the other roller 40B attached to the other movable body 5B. Furthermore, one roller 40A is positioned closer to the digit 2 than the other pulley 20A, and the other roller 40B is positioned closer to the digit 2 than the other pulley 20B (see Figure 1). Therefore, the portion of the circulating wire 10 between one pulley 20A and the other pulley 20B is supported by one roller 40A near the one pulley 20A and by the other roller 40B near the other pulley 20B, thereby restricting the downward movement of the portion of the circulating wire 10 between the one pulley 20A and the other pulley 20B. Therefore, the portion of the circulating wire 10 between one pulley 20A and the other pulley 20B is maintained in a horizontal position by one roller 40A and the other roller 40B, thus maintaining good cutting operation. The rollers 40 (one roller 40A and the other roller 40B) are configured such that, for example, the roller body 40a is rotatable about the rotational axis 40b, and one end and the other end of the rotational axis 40b are fixed to the roller connecting parts 50c, 50c by fixing means 40c, 40c.

[0024] The detection means 60 is a means for detecting changes in the posture of the wire 10 as the cutting of the floor slab 3 by the wire 10 progresses while the movable body 50 is stopped. The detection means 60 is configured to include, for example, a contact-type sensor 61, an oscillator 62, and a contact maintenance means 63.

[0025] The contact-type sensor 61 is, for example, a sensor that incorporates a detection unit and has a contact portion 61a on one end, and is configured such that when the contact portion 62b of the oscillator 62 comes into contact with the contact portion 61a, the detection unit detects the contact and outputs a detection signal.

[0026] The oscillator 62 is a member configured such that, for example, a plate portion 62A forming the main body of the oscillator 62 is rotatably attached via a rotational axis 62a to a detection means connecting portion 50d1 which is provided extending from the base portion 50a, and the oscillator 62 is oscillating about the rotational axis 62a provided in the portion between one end and the other end of the plate portion 62A. The oscillator 62 has a contact portion 62b on one end of the plate portion 62A and a contact roller 62c on the other end of the plate portion 62A. The contact portion 62b is configured such that one end of the plate portion 62A is shaped to easily contact the contact portion 61a of the contact-type sensor 61. The contact roller 62c is composed of a roller rotatably mounted on the other end of the plate portion 62A.

[0027] The contact maintenance means 63 comprises, for example, a cylindrical body 63a containing a biasing means 63c such as a spring, and a biasing shaft 63b housed in the cylindrical body and biased by the biasing means 63c. The contact maintenance means 63 is fixed to a detection means connecting portion 50d3, which is provided so as to extend from the pulley connecting portion 50b, with the cylindrical body 63a being fixed to it. The biasing shaft 63b is connected at one end to a connecting portion at one end of the plate portion 62A of the oscillator 62, and at the other end is formed as a force receiving portion that receives force from the biasing means 63c inside the cylindrical body 63.

[0028] In other words, the detection means 60 is configured such that the oscillator 62 oscillates around the rotational axis 62a as the center of rotation, and the on / off state is detected when the contact portion 62b of the oscillator 62 makes contact with or separates from the contact portion 61a of the contact-type sensor 61. In other words, when the control means 6 detects that the contact portion 62b of the oscillator 62 and the contact portion 61a of the contact sensor 61 have separated, that is, that the contact sensor 61 has turned off (when no detection signal is output from the contact sensor 61), the control means 6 drives the motor 51a to move the movable body 5 by a predetermined distance. Furthermore, the biasing shaft 63b functions to maintain the state in which the contact portion 62b of the oscillator 62 is in contact with the contact portion 61a of the contact-type sensor 61 by receiving force from the biasing means 63c. Furthermore, if the contact roller 62c of the oscillator 62 receives a force from the wire 10 greater than the biasing force of the biasing means 63c, the oscillator 62 rotates in a direction that pushes the biasing shaft 63b back toward the cylindrical body 63 against the biasing force from the biasing means 63c, thereby separating the contact portion 62b of the oscillator 62 from the contact portion 61a of the contact-type sensor 61. Furthermore, the detection means connecting portion 50d1 is provided with a stopper 65 that restricts the rotation of the oscillator 62 from being excessively rotated by the force of the biasing means 63c. The oscillator 62 is configured to maintain proper contact between the contact portion 62b of the oscillator 62 and the contact portion 61a of the contact-type sensor 61 by contacting the stopper 65. In addition, the detection means connecting portion 50d1 has an arc-shaped elongated hole 66 formed therein for fine-tuning the position of the stopper 65.

[0029] As described above, the pulley 20, roller 40, and detection means 60 are connected to the movable body 5, so that the pulley 20, roller 40, and detection means 60 can move on the guide rail 30 via the movable body 5. In other words, when the motor 51a of the movable body 5 is driven to rotate the motor shaft 51b, the pinion 51c connected to the motor shaft 51b moves on the rack 31, and the wheels 54a, 54a... of the movable body 5 travel on the upper running surface 32a and the lower running surface 32b of the guide rail 30. As a result, the pulley 20, roller 40, and detection means 60 provided on the movable body 5 are configured to move along the extension direction of the guide rail 30.

[0030] Furthermore, on the moving component connecting portion 50e, on the side facing the direction of movement S and on the side opposite to the direction of movement S, are provided moving end detection sensors 67a and 67b, respectively, for detecting the moving end of the movable body 5. In other words, when the movable end detection sensors 67a and 67b of the movable body 5 come into contact with the end portion of the cutting work section provided on the end side of the object to be cut, the control means 6 detects the detection signal from the movable end detection sensors 67a and 67b and stops the motor 51a, thereby stopping the movement of the movable body 5.

[0031] Next, the automatic control by the control means 6, which controls the timing of the movement of the movable body 5 along the guide rail 30 and the timing of the stopping of the movable body 5, will be explained based on Figures 1 and 6.

[0032] First, one movable body 5A and the other movable body 5B are set to their initial state. In the initial state, the contact portion 62b of the oscillator 62 is set to be separated from the contact portion 61a of the contact-type sensor 61 (as shown in Figure 6(c)). For example, after setting one pulley 20A and the other pulley 20B and the wire 10 to the state shown by the solid line in Figure 1, the power is turned on. As a result, the control means 6 activates the wire drive mechanism 4 and detects the initial state, i.e., the off state of the contact sensor 61, and drives the motor 51a of the movable body 5. In other words, the control means 6 moves the movable body 5 (5A, 5B) by a predetermined distance as shown by arrow b1 so that the pulley 20 (20A, 20B) reaches the position shown by the dashed line (double dot line) in Figure 1. Then, when the control means 6 detects that the movable body 5 has moved a predetermined distance based on the output from the rotary encoder 53, it outputs a motor stop signal to the motor 51a. In other words, by moving the movable body 5(5A, 5B) by a predetermined distance as shown by arrow b1 in Figure 1, the wire 10 changes from the state shown by the solid line in Figure 1 to the state shown by 10(b), and the cutting target area 3A between wire 10(a) and wire 10(c) becomes the cutting allowance. Then, the circulating wire 10 is pulled, and the portion of the wire 10 between one pulley 20A and the other pulley 20B comes into contact with the part to be cut 3A, changing from state 10(b) to state 10(c) in Figure 1, thereby cutting the part to be cut 3A. In other words, while the wire 10 is moving from state 10(b) in Figure 1 (the state shown in Figure 6(a)) to state 10(c) (the state shown in Figure 6(c)), that is, during the cutting operation by the wire 10, the contact portion 62b of the oscillator 62 is maintained in contact with the contact portion 61a of the contact-type sensor 61 by the function of the contact maintenance means 63. That is, during the cutting operation by the wire 10, the control means 6 does not detect the off state of the contact-type sensor 61, so the motor 51a remains stopped and the movable body 5 does not move. That is, as the cutting operation progresses, the portion of the wire 10 between one pulley 20A and the other pulley 20B moves in the direction of travel S, changing from the state shown in Figure 6(a) to the state shown in Figure 6(b). In the state shown in Figure 6(b), the force from the biasing means 63c of the contact maintenance means 63 is greater than the force from the wire 10 applied to the contact roller 62c of the oscillator 62, so the contact portion 62b of the oscillator 62 and the contact portion 61a of the contact-type sensor 61 remain in contact. As the cutting operation progresses, the portion of the wire 10 between one pulley 20A and the other pulley 20B moves further in the direction of travel S, resulting in the state shown in Figure 6(c). In the state shown in Figure 6(c), the force from the wire 10 applied to the contact roller 62c of the oscillator 62 becomes greater than the force from the biasing means 63c of the contact maintenance means 63, causing the contact portion 62b of the oscillator 62 to move away from the contact portion 61a of the contact sensor 61. That is, the oscillator 62 rotates in a direction that moves the contact portion 62b away from the contact portion 61a. Therefore, the control means 6 detects the off state of the contact sensor 61 and drives the motor 51a of the movable body 5. That is, the control means 6 moves the movable body 5 (5A, 5B) by a predetermined distance as shown by arrow b2 in Figure 1.

[0033] In other words, in the cutting device 1 with the above configuration, the control means 6 repeatedly performs a movable body drive process, which moves the movable body 5 by a predetermined distance and then stops it when the detection means 60 detects that the wire 10 has reached a predetermined position, and a movable body stop and maintain process, which keeps the movable body 5 stopped until the cutting work of the floor slab 3 by the wire 10 progresses and the wire 10 reaches the predetermined position. This enables automatic control of the movement and stopping operations of one pulley 20A and the other pulley 20B, which serve as fulcrums during cutting. In other words, in the cutting device 1, the movable body 5, which is equipped with a pulley 20, a roller 40, and a detection means 60, is equipped with a motor 51a having a pinion 51c that meshes with a rack 31 provided on the guide rail 30, and the control means 6 is configured to drive the motor 51a to move the movable body 5 by a predetermined distance in the movable body drive process, and to maintain the motor 51a in a stopped state in the movable body stop maintenance process. Therefore, according to the cutting device 1 of this embodiment, it is possible to automatically control the movement and stopping operations of the fulcrum pulley 20 (20A, 20B), which is a driven pulley that acts as a fulcrum during cutting, on the guide rail 30 (30A, 30B), thereby enabling automatic control of the cutting operation. In other words, the cutting device 1 according to this embodiment is equipped with a control means 6 that controls the movement and stopping of one movable body 5A on which one pulley 20A is provided and the other movable body 5B on which the other pulley 20B is provided, thereby enabling automatic control of the movement and stopping operations of one pulley 20A and the other pulley 20B, and thus enabling automatic control of the cutting operation.

[0034] Furthermore, the control means 6 is implemented by, for example, a PLC (Programmable Logic Controller) or computer hardware that executes a program to repeatedly perform the aforementioned movable body driving process and movable body stop-maintaining process.

[0035] Furthermore, in the cutting device disclosed in Patent Document 1, a hydraulic cylinder extending in the cutting direction S was used as a power source for moving the pivot pulley, which meant that the hydraulic cylinder could interfere with the crossbeam, posing a challenge to the handling of the cutting device. However, according to the cutting device 1 of this embodiment, a rack and pinion mechanism with a motor as the power source is used as the mechanism for moving the pivot pulleys 20 (20A, 20B), which allows for miniaturization of the cutting device 1 and provides a cutting device 1 with excellent handling properties.

[0036] Furthermore, in the cutting device 1 according to Embodiment 1, the combination of rack and pinion and rotary encoder 53 allows for the detection of the travel distance of the movable body 5, thus enabling visualization of the amount of movement of the pulley 20 provided on the movable body 5.

[0037] Furthermore, in the cutting device 1 according to Embodiment 1, automatic control of the cutting operation is achieved by repeating the movable body drive process and the movable body stop and maintain process. However, the state of small cutting allowance, which is the timing for performing the movable body drive process, can be predetermined to any arbitrary state. Then, the detection means 60 should be configured such that the contact sensor 61 turns off when the cutting allowance is small, as determined in advance.

[0038] Next, we will provide further explanation regarding the mounting means 41 for attaching the pulley group, wire drive mechanism 4, and cutting device 1 to the lower surface 3u of the floor slab 3.

[0039] For example, the pulley group may include a horizontally arranged pulley group that guides the wire 10 on a horizontal plane, a vertically arranged pulley group that guides the wire 10 on a vertical plane, and a vertical-to-horizontal direction conversion pulley group that guides the wire 10 from a horizontal plane to a vertical plane, or from a vertical plane to a horizontal plane.

[0040] The horizontally arranged pulley group consists of the two aforementioned pivot pulleys 20, 20 that act as pivot points during cutting, and a corner pulley 21, as shown in Figure 1, for example. The vertically arranged pulley group comprises, for example, a drive pulley 22 and a plurality of driven pulleys 23, 24, 25, 26, 27 for changing direction, as shown in Figure 3. The vertical-horizontal direction changing pulley group includes a variable pulley 28 configured to change the direction in which the wire 10 is guided to the horizontal plane, and a fixed pulley 29 whose direction in which the wire 10 is guided to the horizontal plane is constant.

[0041] In other words, the wire 10 is constructed by stretching from one pivot pulley 20 to a variable pulley 28, driven pulleys 23, 24, 25, 26, drive pulley 22, driven pulley 23, fixed pulley 29, and the other pivot pulley 20. Then, the drive mechanism 4 for the wire 10 rotates the drive pulley 22 and moves both or either the drive pulley 22 and the driven pulley 25 in the vertical direction V, thereby pushing the portion of the wire 10 between one pivot pulley 20 and the other pivot pulley 20 into the part to be cut 3A, and the part to be cut 3A is cut.

[0042] For example, as shown in Figure 3, the drive pulley 22 is mounted on a first vertical support 35 that extends in the vertical direction so as to be able to reciprocate in the vertical direction. This first vertical support 35 is attached, for example, to the lower surface 3u of the floor slab 3 via a mounting member 35A provided at its upper end. Furthermore, the driven pulley 25 is mounted on a second vertical support 36 that extends vertically, so as to be able to reciprocate in the vertical direction. This second vertical support 36 is attached, for example, to the lower surface 3u of the floor slab 3 via a mounting member 36A provided at its upper end. Furthermore, the driven pulley 24 is mounted to the second vertical support 36 via a mounting member (not shown) so as to be positioned above the driven pulley 25. Furthermore, the driven pulleys 23, 26, and 27 are each attached to predetermined positions on the horizontal support 37 via mounting members (not shown). This horizontal support 37 is connected to, for example, the first vertical support 35 and the second vertical support 36 via connecting members (not shown). Furthermore, the variable pulley 28 and the fixed pulley 29 are attached to the horizontal support 37 via, for example, mounting members not shown in the figure.

[0043] The drive mechanism 4 for the wire 10 is configured to include a drive pulley control device (not shown) that rotates the drive pulley 22 and moves the drive pulley 22 linearly back and forth in the vertical direction V, and a driven pulley control device (not shown) that moves the driven pulley 25 linearly back and forth in the vertical direction V. The drive pulley control device includes, for example, a pulley rotation motor as a rotational drive source connected to the central axis (not shown) of the drive pulley 22, a bearing that rotatably supports the rotational central axis of the drive pulley 22, and a linear movement mechanism that reciprocates the drive pulley 22 in the vertical direction V along the first vertical support 35.

[0044] The linear movement mechanism is configured to include, for example, a rack and pinion mechanism consisting of a rack provided on the first vertical support 35 side and a pinion (not shown) provided on the drive pulley 22 side that meshes with the rack, a pulley movement motor (e.g., a hydraulic motor) (not shown) as a drive source for rotating the pinion, and a control circuit for the pulley movement motor, etc. In other words, by rotating the pinion, the drive pulley 22 is configured to reciprocate in the extension direction of the rack, that is, in the vertical direction V of the first vertical support 35.

[0045] The driven pulley control device includes, for example, a linear motion mechanism that reciprocates the driven pulley 25 in the vertical direction V along the second vertical support 36, and this linear motion mechanism is configured similarly to the linear motion mechanism of the drive pulley control device.

[0046] The mounting means 41 for attaching the cutting device 1 to the lower surface 3u of the floor slab 3 includes, for example, as shown in Figure 2, a floor-side mounting member 43 attached to the lower surface 3u of the floor slab 3 with anchor bolts 39 or the like, and a guide rail-side mounting member 44 attached to the guide rail 30. The guide rail-side mounting member 44 is mounted so as to be movable in the vertical direction relative to the upper and lower extension plates 43a of the floor-side mounting member 43, thereby providing a vertical position adjustment mechanism that allows the vertical position height of the guide rail 30 to be adjusted and the vertical position of the movable body 5 to be adjusted. In other words, the mounting means 41 is configured to fix the guide rail 30 to the lower surface 3u of the floor slab 3 and to include a vertical position adjustment mechanism for adjusting the vertical position of the guide rail 30. For example, the mounting means 41 is configured to include a vertical position adjustment mechanism such as vertical adjustment screws 45 and positioning screws 46. For example, both ends of the guide rail 30 are attached to the underside 3u of the floor slab 3 by mounting means 41, 41. In this case, once the cutting work corresponding to the length of the guide rail 30 is completed by moving one movable body 5A and the other movable body 5B from one end to the other of the guide rail 30, the mounting means 41, 41 are removed from the floor slab 3, the mounting means 41, 41 and the guide rail 30 are moved forward, the mounting means 41, 41 are attached to the underside 3u of the floor slab 3 to reinstall the guide rail 30, and then the cutting work is resumed. This process is repeated, allowing the cutting work to continue.

[0047] In this way, by attaching the cutting device 1 to the lower surface 3u of the deck slab 3 and driving the wire 10 while the cutting device 1 is supported by the deck slab 3, the cutting target area 3A, which is the part of the deck slab 3 near the boundary with the upper surface 2t of the girder 2, can be cut during deck slab replacement work without impairing the use of the area around the deck slab, i.e., the use of the road, and with a low possibility of damaging the girder 2 to be reused.

[0048] In this embodiment, a rack and pinion system using a motor 51a as the power source for moving the movable body 5 was exemplified. However, a power cylinder such as a hydraulic cylinder, pneumatic cylinder, water-pressure cylinder, or electric cylinder, or other actuators may also be used as the power source for moving the movable body 5. In this case, a control means can be configured to control the movement and stopping of the movable body 5 (control that repeatedly performs the movable body driving process and the movable body stopping and maintaining process described above) by controlling the amount of movement of the power cylinder or other actuators that serve as the power source.

[0049] Furthermore, although the embodiment illustrates a configuration in which the cutting device 1 is attached to the lower surface 3u, the cutting device 1 may also be attached to the inclined lower surface 3ut of the haunch portion of the floor slab 3. For example, the mounting means 41 may be attached to the inclined lower surface 3ut of the haunch portion of the floor slab 3.

[0050] Furthermore, the cutting device does not necessarily have to be attached to the lower surface 3u of the floor slab 3. For example, a dedicated support device (frame) may be installed below the floor slab 3, and the cutting device may be attached to this support device for cutting.

[0051] Furthermore, while the cutting device 1 described above is exemplified by a device equipped with a roller 40 as a restricting member that restricts the downward movement of the wire 10 that is placed on the pulley 20, the restricting member does not necessarily have to be a roller; any member that can restrict the downward movement of the wire 10 placed on the pulley 20 is acceptable.

[0052] Alternatively, the configuration may not include the roller 40 as a regulating member.

[0053] Furthermore, although the embodiment illustrates a method of cutting a concrete slab as the target of cutting, the target of cutting may also be a concrete structure other than a slab, a steel structure, or other structure. For example, the present invention can be applied to cutting road bridges, railway bridges, or structures such as box culverts and wall parapets, and can achieve good cutting performance.

[0054] Also, there may be only one pulley 20. In other words, the cutting device according to the present invention comprises a guide rail 30, a movable body 5 movably mounted along the guide rail 30, a pulley 20 provided on the movable body 5, an endless annular wire 10 stretched across a plurality of pulleys including the pulley 20 and a drive pulley 22, and a wire drive mechanism 4 for driving the wire 10, and cuts a structure by driving the wire with the wire drive mechanism 4 to bring the wire into contact with the structure, and the cutting device is configured to include control means 6 for controlling the movement and stopping of the movable body 5. In other words, according to the cutting device of the present invention, there may be only one movable body 5 with a pulley 20, and the control means 6 moves the movable body 5 with the pulley 20, and then the wire drive mechanism 4 drives the wire 10 to bring the wire 10 into contact with the structure, thereby cutting the structure. [Explanation of symbols]

[0055] 1. Cutting device, 2. Beam, 3. Floor slab (structure), 3A. Cutting target area, 4 wire drive mechanism, 5 movable body, 6 control means, 10 wire, 20 pulley, 22 drive pulley, 31 rack, 51a motor, 51c pinion, 60. Detection means.

Claims

1. A cutting device comprising a guide rail, a movable body mounted to move along the guide rail, a pulley mounted on the movable body, an endless annular wire stretched across a plurality of pulleys including the pulley and a drive pulley, and a wire drive mechanism for driving the wire, wherein the wire drive mechanism drives the wire to bring the wire into contact with the structure and cut the structure, It is equipped with control means for controlling the movement and stopping of a movable body, The movable body is equipped with a detection means for detecting changes in the attitude of the wire that fluctuate as the wire cutting operation progresses while the movable body is stopped. The cutting device is characterized in that the control means alternately repeats a movable body drive process, which moves the movable body by a predetermined distance and then stops it when the detection means receives that the wire's orientation has reached a predetermined orientation, and a movable body stop and maintain process, which maintains the movable body in a stopped state while the wire cutting operation progresses and the wire's orientation returns to the predetermined orientation.

2. The guide rail comprises one guide rail and another guide rail installed parallel to the first guide rail. The movable body comprises one movable body that is movably mounted along one guide rail, and another movable body that is movably mounted along the other guide rail. The pulley system comprises one pulley provided on one movable body and another pulley provided on the other movable body. The cutting device according to claim 1, characterized in that an endless annular wire is stretched over a plurality of pulleys including one pulley, the other pulley, and a drive pulley, and the portion of the wire between the one pulley and the other pulley, driven by a wire drive mechanism, is brought into contact with a structure to cut the structure.

3. The structure is a deck slab attached to the top surface of the girder. One guide rail and the other guide rail are positioned with the girder in between. The cutting device according to claim 2, characterized in that the portion of the wire driven by the wire drive mechanism between one pulley and the other pulley is configured to cut the portion of the floor slab to be cut near the boundary between the floor slab and the upper surface of the girder.

4. The movable body is equipped with a motor having a pinion that engages with a rack mounted on a guide rail, The cutting device according to claim 1, characterized in that the control means drives a motor to move the movable body by a predetermined distance in the movable body driving process, and maintains the motor in a stopped state in the movable body stop maintenance process.

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